获取最后插入的ID

Question

I want to get the ID of the last row inserted into a table and use it with a variable in SQL Server.

Here is my code:

SELECT IDENT_CURRENT('profiles')

I tried adding a where clause

SELECT IDENT_CURRENT('profiles') WHERE profiles.userid = '2'

Here is my error:

The multi-part identifier "profiles.userid" could not be bound.

Answer 1

Your 2nd Query

To make the second query with the WHERE clause work ( to the extent that it does not error ), you need to anchor the multi-part identifier profiles.userid with a FROM :

SELECT IDENT_CURRENT('profiles') FROM profiles WHERE profiles.userid = '2'

But this does not make a lot of sense because the WHERE clause will not really change the bottom-line result (ie the last identity generated for profile ) - just possibly include it more than once in the result set.

Back to Your 1st Query

If you really want to get the last identity value generated for profile to delete the row it identifies, then your first query...

SELECT IDENT_CURRENT('profiles')

...is the direction to go.

Of course, you will then need to employ the last identity value generated for profile in a DELETE statement rather than just a SELECT - for example (assuming that the identity column in profiles is id )...

DECLARE @lastID int;
SELECT @lastID = IDENT_CURRENT('profiles');

DELETE FROM profiles WHERE id = @lastID;

..., which would really just be better said as:

DELETE FROM profiles WHERE id = IDENT_CURRENT('profiles');